Children call doesn't work on ICD10 D45

[hsolbrig]

http://informatics.mayo.edu/cts2/rest/codesystem/ICD10/version/1998/entity/D45/children doesn't return any children. There are actually many of these

[kevinpeterson]

I checked the XML coming out of Bioportal (http://rest.bioontology.org/bioportal/concepts/44103?conceptid=D45&apikey=xxxxxxx), and there seems to be no children in the result. We key off the 'SubClass' tag in the 'relations' tag of the Bioportal XML to compute children.

[kevinpeterson]

A few adjustments on how 'children' are linked:

http://informatics.mayo.edu/cts2/rest/codesystem/ICD10/version/1998/entity/G40-G47.9

will show a 'children' URL of

http://informatics.mayo.edu/cts2/rest/codesystem/ICD10/version/1998/entity/G40-G47.9/children

A resource that has no children:

http://informatics.mayo.edu/cts2/rest/codesystem/ICD10/version/1998/entity/G45.3

will have a empty children tag ( ) to explicitly assert that there are no children for this resource.